Design of a Baseband Receiver for DVB-T Standard
Date Issued
2005
Date
2005
Author(s)
Lin, Keng-Hsien
DOI
zh-TW
Abstract
This thesis proposes a baseband receiver and a baseband equivalent channel model according to the transmitter and system specification of Euporean DVB-T standard. The baseband equivalent channel model includes effects of multipath fading channel, Additive White Gaussian Noise (AWGN), Carrier Frequency Offset (CFO), Sampling Frequency Offset (SCO), and phase noise. DVB-T system has two choices in Fast Fourier Transform (FFT) size and four choices in Guard-Interval Ratio (GR) size, so a DVB-T reciever should detect FFT mode and GR mode used in the transmitter in the beginning. This thesis proposes a two-stage mode detection algorithm to perform the function, and combines algorithms of symbol timing detection, CFO acquisition, compensation, and tracking as well as SCO, 2k-8k FFT processor, phase modification, channel estimation and compensation, soft-out demapper, and soft-in Viterbi decoder to implement the whole system of DVB-T receiver. In hardware circuit design, this thesis also proposes to use output SNR instead of Bit Error Rate (BER) as the metric of optimum wordlength and use piecewise linear approximation algorithm to save hardware cost with tolerable approximation error. Through system performance simulation and verification of whole system RTL Verilog, the proposed DVB-T baseband receiver is proven to work well.
Subjects
數位電視
基頻接收機
正交分頻多工
基頻通道
定點數
電路設計
Digital TV
Baseband Receiver
OFDM
Baseband Channel
Fixed-Point
Circuit Design
Type
thesis
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